Passwords can be easy to crack into, and that is why adding two-factor authentication to email helps make it more secure. The second level of security requires something like a mobile device or
a smart card or fingerprints to help make email difficult to break into. Gmail and Yahoo both offer two-factor authentication tools. Microsoft doesn't offer it for all Outlook.com users, but paying
customers that are members of Xbox Live, Microsoft's online billing portal, or Sky Drive can add a two-factor authentication tool.
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